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English: 1=Methylobacteria as epiphytes and endophytes. Scanning electron micrograph of the surface of a leaf from a regenerated, germ‑free sunflower (Helianthus annuus) plantlet cultured in vitro. The tissue was inoculated with a strain of Methylobacterium that was isolated from a free‑living sunflower plant (M. sp.). A cluster of methylobacteria can be seen at the outer surface of a stomatum (S) (arrow). Single bacteria are visible in the pore of the stomatum and apparently invade the plant body (arrow head). Bar = 0.5 mm.